value	unc_up	unc_lo	author	ref	method
17.47	0.120	0.120	Masiero	2014ApJ...791..121M	NEATM
18.71	0.167	0.167	Masiero	2011ApJ...741...68M	NEATM
20.49	2.000	2.000	Tedesco	2002AJ....123.1056T	STM